Bloody hell....did you buy lemons each time or what?!
My household collection (ignoring the classic mini and Mazda RX8) over a similar period has been:
e34 525 manual
e36 325 coupe auto (modified) & e36 318 compact manual
e39 528 manual (modified quite a lot!) and e46 320
e46 325 Sport (modified) and e46 320 (modified)
e46 330 Sport auto (modified)
e92 335 Highline manual (modified) and e93 320 (modified)
F32 435 Sport and E70 X5 3.0d
The most recent 2 are about the only completely standard cars I've owned!